How to know the real size of a web page?

performance

Solution

Use firefox, and get FireBug.

Then get the YSlow addon for firefox.

For IE, you can get the DebugBar which comes pretty close to giving the same information.

Problem

I wan't to know the real size of a web page (HTML + CSS + Javascript + Images + etc.) but from the browser side, maybe with a software, Firefox Add-On or similar?

Original source